Our Association was one of the signers of a July 11, 2013, letter to Dr. Beth Unger of the Centers for Disease Control and Prevention (CDC) and others, including the clinicians involved in the CDC’s multi-site research study, urging the CDC to include certain objective tests in their studies of ME/CFS patients. The tests recommended are: Cardiopulmonary exercise testing (CPET), specifically the two-day CPET regimen known as the Stevens Protocol, and lab tests which measure Natural Killer Cell function and viral load, including enteroviruses.